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Abstract

This paper presents the method and performance of the photoacoustic resonant cell remodified from a Helmholtz cavity that can be used to improve excitation of acoustical signal of the photoacoustic cell by photoacoustic effect. The other advantages of this method are that it can be used to detect flowing trace gases and it has small volume. In our experiments, the conventional nonresonant cell, the original Helmholtz resonant cell, and the remodified Helmholtz resonant cell were designed and tested respectively, based on the measurement of the CO2 contribution of the photoacoustic signal. The nonresonance test of the trace gas analyte CO2 conducted at 125Hz demonstrated signal about 4mV for CO2 concentrations at 300ppm and signal-to-noise (S/N) value (∼32∶1). The original Helmholtz resonant test of the same analyte gas conducted at its resonant frequency demonstrated signal about 43mV and S/N value (∼340∶1). The remodified Helmholtz resonant test of the same analyte gas conducted at its resonant frequency demonstrated large signal about 67mV and high S/N value (∼536∶1). The test results show that the remodified Helmholtz photoacoustic resonant cell has a more outstanding measuring performance and more sensitivity compared to the two others.

References

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